B. 83 / 83
ExplanationStep 1: In the AP a=7 and d=4. Step 2: a20=a+19d=7+76=83. Step 3: In nth term add d n-1 times.
Step 1: AP में a=7 और d=4 है। Step 2: a20=a+19d=7+76=83। Step 3: nth term में d को n-1 बार जोड़ें।
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