B. 79
ExplanationStep 1: In AP a=9 and d=5. Step 2: a15=a+14d=9+70=79. Step 3: In nth term add d n-1 times.
Step 1: AP में a=9 और d=5 है। Step 2: a15=a+14d=9+70=79। Step 3: nth term में d को n-1 बार जोड़ें।
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