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प्रश्न
If 6 times of 6th term of an A.P. is equal to 7 times the 7th term, then the 13th term of the A.P. is
पर्याय
0
6
7
13
उत्तर
0
Explanation;
Hint:
6t6 = 7t7
6(a + 5d) = 7(a + 6d)
6a + 30d = 7a + 42d
7a + 42d – 6a – 30d = 0
a + 12d = 0 = t13
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