The 21st term of AP whose first two terms are -3 and 4 is:
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137
Step-by-step explanation:
In the given AP, t1 = -3 and t2 = 4
=> d = t2 - t1
=> 4 - (-3)
=> 7
=> tn = a + (n-1)d
=> t21 = (-3) + (21-1)(7)
=> 137
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