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प्रश्न
The 20th term of an A.P, whose first term is – 2 and the common difference is 4, is ______.
विकल्प
78
74
– 36
– 34
उत्तर
The 20th term of an A.P, whose first term is – 2 and the common difference is 4, is 74.
Explanation:
an = a + (n – 1) d
a20 = – 2 + 19 × 4 = 74
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