Text Solution
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`
Choose the correct alternative answer for the following sub question
Find d of an A.P. whose first two terms are – 3 and 4
Concept: Arithmetic Progression
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