Question

34. The sum of the first four terms of an AP. is 56. The sum of the last four terms is 112. If its
first term is 11, then find the number of terms.

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Answer 1

Answer:

n = 11

Step-by-step explanation:

Solution given in the attached pic.

Verification:

The terms: 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31

Sum of first four terms = 11+13+15+17 = 56

Sum of last four terms = 25+27+29+31 = 112