The 21st term of the AP whose first two terms are –3 and 4 is ______.

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The 21st term of the AP whose first two terms are –3 and 4 is 137. Explanation: First two terms of an AP are a = – 3 and a2 = 4 We know, nth term of an AP is an = a + (n – 1)d Where, a = first term an is nth term d is the common difference a2 = a + d 4 = – 3 + d d = 7 Common difference, d = 7 a21 = a + 20d = – 3 + (20)(7) = 137

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