# IMO Level 1- Mathematics Olympiad (SOF) Class 10: Questions 629 - 634 of 968

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## Question number: 629

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MCQ▾

### Question

The sum of all terms of the arithmetic progression having ten terms except for the first term, is 99, and except for the sixth term, 89. Find the third term of the progression if the sum of the first and the fifth term is equal to 10.

### Choices

Choice (4) Response

a.

10

b.

8

c.

5

d.

15

## Question number: 630

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MCQ▾

### Question

If the term of an A. P. is and term is, then the sum of first terms is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 631

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MCQ▾

### Question

If four numbers are in A. P. such that their sum is 20 and the greatest number is 2 times the least, then the numbers are ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 632

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MCQ▾

### Question

If , then is equal to ________

### Choices

Choice (4) Response

a.

1553

b.

1353

c.

1323

d.

1243

## Question number: 633

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MCQ▾

### Question

The sum of the first term and the fifth term of an ascending A. P. is 26 and the product of the second term by the fourth term is 160. Find the sum of the first seven terms of this A. P

### Choices

Choice (4) Response

a.

110

b.

112

c.

114

d.

116

## Question number: 634

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MCQ▾

### Question

In an A. P. , the sum of first n terms is, find its term

### Choices

Choice (4) Response

a.

126

b.

178

c.

179

d.

175

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