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Let the first three terms 2, p and q, with q ≠ 2, of a G.P. be respectively the 7 th , 8 th and 13 th terms of an A.P. If the 5 th term of the G.P. is the n th term of the A.P., then n is equal to

1. 151
2. 169
3. 177
4. 163

Correct answer: 163

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