Find d of an A.P. whose first two terms are -3 and 4 A 7 (b) 4 (c) -7 (d) -3

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17137143-143

Answer : B

Solution : Given, first two terms of an AP are a = -3 and a + d = 4. <br> `implies -3+d=4` <br> Common difference, `d=7` <br> ` :. a_(21)=a+(21-1)d " " [ :' a_(n)=a+(n-1)d]` <br> ` " " = -3+(20)7` <br> ` " " =-3+140= 137`

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Find d of an A.P. whose first two terms are – 3 and 4

Concept: Arithmetic Progression

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